Claw device

ABSTRACT

In a strip handling apparatus of the type in which a plurality of strip types may be moved in a first transporting direction from a supply station to a take up station. Each of the strip types have equidistant perforation holes. The perforations of different strip types have different perforation pitches, each of the perforation holes having a forward and a rearward edge seen in the transporting direction, whereby with aligned forward edges of a first perforation hole of each of the different strip types, second respective perforation holes, which follow when seen in transporting direction only partly overlap each other. The apparatus comprises a shuttle mechanism located between the supply station and the take up station. A drive device is adapted to impart a first movement to the shuttle mechanism cyclically in and out of engagement with the perforation holes of the strips. The drive device is further adapted to impart a second movement to the shuttle mechanism cyclically and in synchronism with the first movement up and down parallelly with the path of movement of one of the strips to move the same in transporting direction. First and second teeth on the shuttle mechanism are numbered, as when seen in the transporting direction. The teeth have forward and rearward surfaces opposite to each other, the surfaces of each of the teeth having a distance from each other. At least the second tooth is adapted to engage the forward edges of the perforation holes of the strips, when transported in the transporting direction, the distance between the forward and rearward surface of the second tooth corresponding to the space between the forward and rearward edges of the smallest perforation holes of one of the strip types to be used less a tolerance; the distance between the forward surface of the second tooth and the rearward surface of the first tooth increased by a further tolerance corresponds to the smallest existing distance on the strip types between the forward edge of the first perforation hole and the rearward edge of the second perforation hole; the distance of the rearward surface of the second tooth to the forward surface of the first tooth reduced by another tolerance corresponding to the largest existing distance on the strip types between the rearward edge of the first perforation hole and the forward edge of the second perforation hole.

'Krob et al.

- [111 3,775,000 Nov. 27, 1973 CLAW DEVICE Inventors: Erwin Krob, AlfonsValoh,

both of Vienna, Austria [73] D Assignee: Karl Vockenhuber and RaimundHauser, Vienna, I Austria 22 Filed: Jan. 12,1972 [21 Appl. No.: 217,322

[30] Foreign Application Priority Data Jan. 22, 1971 Austria A 555 52Us. Cl. 352/79, 352/191 [51 Intt'Cl. G03b 41/00 [58] Field ofSearch..... 352/79, 191, 192,

[56] References Cited UNITED STATES PATENTS 3,514,196 5/1970 Romam.352/79 3,428,395 2/1969 Mitchell 3,640,441 2/1972 Keznickl 352/195Primary Examiner-Monroe H. Hayes AttorneyErnest G. Montague rationholes. The perforations of different strip types have differentperforation pitches, each of the perforationv holes having a forward anda rearward edge seen in the transporting direction, whereby with alignedforward edges ofa first perforation hole of each of the different striptypes, second respective perforation holes, which follow when seen intransporting direc tion only partly overlap each other. The apparatuscomprises a shuttle "mechanism located between the supply stationand'the take up station. A' drive device is adapted to impart a firstmovement to the shuttle mechanism cyclically in and out of engagementwith the perforation holes of the strips. The drive device is furtheradapted to impart a second movement to the shuttle mechanism cyclicallyand in synchronism with the first movement upand down parallelly with'the path of movement of one of the strips to move the same intransporting direction. First and second teeth on the shuttle mechanismare numbered, as when seen in the transporting direction. The teeth haveforward and rearward surfaces opposite to each other, the surfaces ofeach of the teeth having a distance from each ward surface of the secondtooth and the rearward surface of the first tooth increased by a furthertolerance corresponds to the smallest existing distance on the striptypes between the forward edge of the first perforation hole and therearward edge of the second perforation hole; the distance of therearward surface of the second tooth to the forward surface of the firsttooth reduced by another tolerance corresponding to the largest existingdistance on the strip types between the rearward edge of the firstperforation hole and the forward edge of the second perforation hole.

1 Claim, 3 Drawing Figures United States Patent 1 [111-3,775,000-

Krob et al. [4s] Nov. 27, 1973 PMENTEU NOV 2 7 I975 F/GJ v FIG. 2

' :aCLA W DEV-IQETE *'-l he.invention{isconcemedwith a claw device in"recording' 'or.playb ack2:apparatus, particularly substandard formatfilm projectors 'for perforatedinformation carriers with :different'perforation "pitch whereby two perforation holes of said carriersperfectly coincide, while-the following holes seen in 'runningdirectionof the strip partlyoverlap,'thispreferably with super 8 and normal8films respectively, said clawdevice being profilm,it'is preferred todispose the distance of thejfront surface to the rear surface of thesecond tooth lar'ge'r vided=with a clawwithtwoteethinparticular'of,differ 'ent thickness of which at least thesecondtooth',"related -toathen'unning direction of thestrip, shows afro'ntsurlface-with-which uponiforward" run of the strip it meshes withcthefront edges of the strip perforatiomsaid tooth Ihaving a-:rearsurface-opposite the control surfaceand the first tooth correspondinglyshowing a front surface facing'the rear surface of the second tooth anda rear surface opposite-saidfront surface.

. Effortshave-always been made to create claw devices for iathetransport of a striplike perforated ,infonnation .carriers, which enablethe transport of strips of differe'nt-sizes. During the last time theefforts madein cinematographygconc'entrated on the problem to use thesame apparatus for bothsuper 8 and no rmal'8 films due .tosthe-factthattheirdimensionsdiffe'r only slightly. Besides,-,intermittent transportmeans have been developed in which a so-calleddouble-tooth clawperformed the transport of the striplike perforated "informationcarrier. As itis'known, multiple tooth claws have the advantage that-thefilm isfransported eventhen, when oneofthe perforation holes is torn.Beyond-that, the mechanical strain of thefilm may be assigned to-several:p'erforation holes, providedthat'the distance between the *two teethcorresponds exactly to the perforation pitchB-Since," however,valreadyin the distances of v the perforation holes-theremay, occur sometolerances, it

is expedient to choosethe tooth distance also in a double tooth claw sothat it corresponds with the perforation pitch including-acertaintolerance. In this case it may be that not always-both of the claw teethabut the perforation edge of the film, but it will be useful to choosethe tolerances so, that this willin general be still the case-Sincewith!different film formats also the perforation pitch: shows somedifferences, "the distance of the two teeth was fixed in a knownconstruction by the least common' multiple'ln this way, the length ofthe claw extended over several perforation holes, whereby "theconstruction of the claw and its mass became relatively large. v

The'scope of the invention was to develop adouble tooth clawassmall aspossible for striplike perforated in formation carriers of differentperforation pitch and different format. According to the invention thisis solved in that the distance of thefront surface of the second toothtothe rear surface of the first tooth, a certain tolerance included,correspondsto the distance of the front edge of the related firstperforation hole to the rear edge of the in running direction followingperforathe distance ofthe rear edge of the first perforation hole to thefront edge of the "in'running direction following perforation hole ofstrips of the other format, as

for instance super 8 filmsf'ln order to let particularly one of the twoteeth operate upon forward run of the tion hole of strips of oneformat,as for instance normal "'8 films, andthatthe distance of theteeth surfaces, facing each other, less a certain tolerance, correspondsto than the corresponding distance of the first tooth. in order todevelop thisirnain tooth as large as possible,it

is expedient, asalready known, th'atthe distance of the front surface tothe rear surface of the second tooth corresponds to the distance of thefrontedge to the rear edge of the smallest perforation hole less atolerance. 1 In order to accommodate in addition the transport lift ofthe claw to the different formats, it is suggested that'the controlarrangement shows two coaxial control curves I for optionally scanningof .a cam follower, whereby each control curve is assigned to the liftmovement' of the claw for one format; From the AustrianPatentSpec'ification No, 282 350a claw control by means of cams hasalready become known, but this invention relates to the possibility tosecure a reverse run of the strip-like perforated information carrierwithout chang- I ing over the control arrangement. Moreover it isnecessary to equalize in, the window the frame position of one formatwith the frame position of the other format.

Thereof results a-special advantage, under the condition that the liftofthe cam follower upon changing over from one control curve to the othercorresponds to'theframing correction, when changing the format.

'As the super 8 film is the format most in. use in the trade, thecontrol curve assigned to this format will be scannedmore frequently;However with outer curves there is'the danger that the control curve isnot always scanned faithfully upon abrupt changing from'the large radiusof curvature to the small one. Hence it follows a particularlyadvantageous embodiment of the invention, if the control curve for super8 format films is designed as inner curve.

Further features and advantages willbecome appar- 'ent fromthespecification of an embodiment with refer- 1; This cam disk 2 isconnected with a shutter 3, which rotates upon forward run of the filmin the direction of the arrow. Further a claw frame 4 is arranged infront of the cam disk 2, which is shiftable in vertical direction andtiltably rests in the ball guides 5. The frame 4 engageswith its bothteeth 6,7 the perforation of the film 8 and transports the same uponforward run in'the direction of the arrow. The optical axis of theilluminating and reproducing arrangement is marked by 9. A

cam follower 10, fixed to the frame 4, engages a groove, which is formedby the two curves 12,13. Of

course the two curves could also be the boundary surfaces of a camerected on the disk 2.

A spring 14 presses the cam follower 10 against the cam disk 2. Theframe 4 further bears two pins 15 and 16, which cooperate with a thighspring 17 mounted on a bolt 18. A vertical slider 19 bears stops 20 and21, by means of which the thigh spring 17 may be joined to one of thepins 15 or 16. Depending on the acting direction of the thigh spring 14the cam follower 10 is pressed either to the curve 12 or 13. The groove11 is designed with a recess 22, which upon scanning the cam follower 10causes a tilting of the frame 4 round the ball guide 5, whereby the clawteeth6,7 engage the perforation holes of the strip-like perforationcarrier.

When the apparatus is switched on, the cam follower transmits themovement predetermined by a control curve 12 or 13 to the claw teeth 6or 7 respectively, whereby the control curve 12 is assigned to the liftmovement 'of the claw for films of super 8 format, the control curve 13for films of normal 8 format. If now for instance a normal 8 film shouldbe transported instead of the set super 8 film, the slider 19 is presseddownwards. The spring arm 17a of the thigh spring 17 is then removedfrom the pin 16 by the stop 21, likewise is the spring arm 17b removedfrom the stop 20 by the pin 15. The spring 17 is now put under stressbetween thestop 21 and the pin 15, whereby the cam follower 10 ispressedagainst the control curve 13. Upon changing over of the cam follower 10from one control curve to the other a determinedpath x is covered.According to DIN 830 sheet 1 and sheet 2 it has been standardized, thatthe engagement of the intermittent transport means for the transportshould occur in front of the window between the third and the secondperforation hole. As however this perforation hole has a differentdistance from the optical axis of the illuminating or reproducingarrangement 9 respectively with the formats to be transported (FIG. 2),and therewith the framing line-in the window would have a differentposition accordingly, this difference x has to be compensated. As lcnownper se, the perforation holes of different formats also show adifference in size. Accordingly, the construction of the teeth of thedouble tooth claw are illustrated as in FIG. 3.

With the transport movement of the claw 4'in forward run, the frontsurface 23 of the tooth 6 engages with both formats in the thirdperforation hole after the ration hole to the rear edge 31 of thefollowing perforation hole of the normal 8 format is larger by atolerance b in the range of approximately 0.1 0.3. At the same time alsothe distance d of the surfaces 24,25 facing each other of the two teeth6,7 is as large as the distance g from the rear edge 29 of the firstperforation hole to the front edge 30 of the following perforation holeof super 8 format plus a tolerance e f in the range of approximately0.5.

In FIG. 3 it is further'made clear, that the distance h from the frontsurface 23 to the rear surface 24 of the tooth 6 is larger than thedistance i from the surface 25 to the surface 26 of the tooth 7.However, in order-to enable the engagement of thetooth 6 into thesmallest perforation hole of both strips to be transported, the distanceh of the front surface 23 to the surfae 24 of the tooth 6 is smaller bya tolerance in the range of approximately 0.3 0.4 than the distance k ofthe front edge 27 to the rear edge 29 of the smallest perforation hole.

Finally it should bementioned that it is not necessary to let the teethof the claw engage perforation holes adjacent each other, as itisadvantageous with super 8 and normal 8 films. The distance of thesurfaces facing each other of the two teeth could cover also severalperforation holes for the transport of two striplike perforatedinformation carriers with a perforation spacing of little difference.

Besides it is particularly expedient to arrange the cam follower on thedeepest point of the control curve, contrary to the illustration inFIG. 1. Therewith it is achieved that the mass of the cam follower doesnot counteract to the spring force as a result of the occurring inertialforces upon scanning the control curves.

Whatis claimed is:

1. In a strip handling apparatus of the type in which a plurality ofstrip types may be moved in a first transporting direction from a supplystation to a take up station, each of said strip types havingequidistant perfofation holes, the perforations of different strip typeshaving different perforation pitches, each of said perforationholeshaving a forward and a rearward edge seen in said transportingdirection, whereby with aligned forward edges of a first perforationhole of each of said different strip types second respective perforationholes which follow when seen in transporting direction only partlyoverlap each other, the apparatus comprisa shuttle mechanism locatedbetween said supply station and said take up station;

drive means adapted to impart a first movement to said shuttle mechanismcyclically in and out of en- I gagement with said perforation holes ofsaid strips, said drive means being further adapted to impart a secondmovement to said shuttle mechanism cyclically and in synchronism withsaid first movement up and down parallelly with the path of movement ofone of said strips to move the same in transporting direction;

first and second teeth on said shuttle mechanism numbered as when seenin said transporting direction, said teeth having forward and rearwardsurfaces opposite to each other, said surfaces of each of said teethhaving a distance from each other;

at least said second tooth being adapted to engage said forward edges ofthe perforation holes of said strips when transported in saidtransporting direction, the distance between the forward and rearwardsurface of said second tooth corresponding to the space between saidforward and rearward edges of the smallest perforation holes of one ofsaid strip types to be used less a tolerance;

the distance between the forward surface of said second tooth and therearward surface of said first tooth increased by a further tolerancecorresponding to the smallest existing distance on said strip typesbetween the forward edge of said first perforation hole and the rearwardedge of said second perforation hole;

the distance of said rearward surface of said second tooth to saidforward surface of said first tooth reduced by another tolerancecorresponding to the largest existing distance on said strip typesbetween said rearward edge of said first perforation hole and saidforward edge of said second perforation hole, and

the distance between said forward surface and said rearward surface ofsaid second tooth is larger than the corresponding distance of saidfirst tooth.

1. In a strip handling apparatus of the type in which a plurality ofstrip types may be moved in a first transporting direction from a supplystation to a take up station, each of said strip types havingequidistant perforation holes, the perforations of different strip typeshaving different perforation pitches, each of said perforation holeshaving a forward and a rearward edge seen in said transportingdirection, whereby with aligned forward edges of a first perforationhole of each of said different strip types second respective perforationholes which follow when seen in transporting direction only partlyoverlap each other, the apparatus comprising: a shuttle mechanismlocated between said supply station and said take up station; drivemeans adapted to impart a first movement to said shuttle mechanismcyclically in and out of engagement with said perforation holes of saidstrips, said drive means being further adapted to impart a secondmovement to said shuttle mechanism cyclically and in synchronism withsaid first movement up and down parallelly with the path of movement ofone of said strips to move the same in transporting direction; first andsecond teeth on said shuttle mechanism numbered as when seen in saidtransporting direction, said teeth having forward and rearward surfacesopposite to each other, said surfaces of each of said teeth having adistance from each other; at least said second tooth being adapted toengage said forward edges of the perforation holes of said strips whentransported in said transporting direction, the distance between theforward and rearward surface of said second tooth corresponding to thespace between said forward and rearward edges of the smallestperforation holes of one of said strip types to be used less atolerance; the distance between the forward surface of said second toothand the rearward surface of said first tooth increased by a furthertolerance corresponding to the smallest existing distance on said striptypes between the forward edge of said first perforation hole and therearward edge of said second perforation hole; the distance of saidrearward surface of said second tooth to said forward surface of saidfirst tooth reduced by another tolerance corresponding to the largestexisting distance on said strip types between said rearward edge of saidfirst perforation hole and said forward edge of said second perforationhole, and the distance between said forward surface and said rearwardsurface of said second tooth is larger than the corresponding distanceof said first tooth.